package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void addCaiPinWithFlavour(DishDTO dishDTO) {

        //向菜品表插入1条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.addCaiPinWithFlavour(dish);

        //插入成功后可以返回自增的主键   到dish的属性id上  详情看mapper。xml文件
        Long dishId = dish.getId();
        //获取insert语句生成的主键值


        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> flavor.setDishId(dishId));
        }
        //向口味表插入n条数据
        dishFlavorMapper.insertFlavorBatch(flavors);

    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageFindDish(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),
                dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageFindDish(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }


    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.selectCaiPinById(id);
            if (dish.getStatus() == 1) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setMealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setMealIds != null && setMealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
//        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.delectById(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteFlavorByDishId(id);
//        }
        //删除菜品表中的菜品数据
        dishMapper.delectByIds(ids);

        //删除菜品关联的口味数据
        dishFlavorMapper.deleteFlavorByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.selectCaiPinById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }


    /**
     * 根据id修改菜品基本信息和对应的口味信息
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.updateDish(dish);
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //删除原有的口味数据
            dishFlavorMapper.deleteFlavorByDishId(dish.getId());
            flavors.forEach(flavor -> flavor.setDishId(dish.getId()));
            //向口味表插入n条数据
            dishFlavorMapper.insertFlavorBatch(flavors);
        } else if (flavors == null ||flavors.size()==0) {
            //删除原有的口味数据
            dishFlavorMapper.deleteFlavorByDishId(dish.getId());
        }

    }
    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish =Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();


        return dishMapper.list(dish);
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     * @return
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.updateDish(dish);
        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> list = new ArrayList<>();
            list.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(list);
            if (setmealIds != null && setmealIds.size() > 0) {
                setmealIds.forEach(setmealId -> {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                });
            }
        }
    }
}
